Matrix NAVAN CNX200, System Manual

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Matrix NAVAN CNX200 System Manual 449
Jitter Buffer
The speed at which voice packets travel through a network depends on the condition of the network. All voice
packets may not come at the same speed. This variation in the delay in receiving packets, known as Jitter, affects
voice quality. Jitter Buffer helps overcome the delay in receiving voice packets and improves voice quality
. Jitter
Buffer receives voice packets, stores them and sends it to the DSP to process it at evenly spaced intervals, thus
improving voice quality.
NAVAN supports two types of Jitter Buffer: Static and Dynamic . Static Jitter Buffer's internal delay is static,
whereas, the Dynamic Jitter Buffer's internal delay adapts itself to the jitter in the network.
1.
Select the Jitter Buffer Type as Static or Dynamic .
If you select Static Jitter Buffer, configure the ' Minimum Delay '. The value configured in the Minimum
Delay determines the size of the Static Jitter buffer.
If you select Dynamic Jitter Buffer, configure the ' Optimization Factor ' and ' Minimum Delay '. The
minimum size of the Dynamic Jitter buffer depends on the 'Minimum Delay' configured. The Optimization
Factor determines the rate of adaptation of the Dynamic Jitter Buffer to the jitter in the network.
2.
Set the Optimization Factor (only if you select Dynamic Jitter Buffer) to the desired value from 01 to 13.
Default: 10.
In networks with higher jitter, a higher value should be configured as Optimization Factor.
The actual size of the Dynamic Jitter Buffer will be determined by the DSP on the basis of the Optimization
Factor configured and actual network condition. Dynamic Jitter buffer can go up to maximum 300
milliseconds.
3.
Set the Minimum Delay (msec) (for both Static and Dynamic Jitter Buffer) to the desired value from 10 to
280 milliseconds. Default: 10.
The Minimum Delay determines the size of the Static Jitter Buffer. When Jitter Buffer type is selected as
Static, the Minimum Delay defines the size of the Static Jitter Buffer. The Static Jitter Buffer will store each
received voice packet for the configured time and then it will send it to DSP for voice processing.
When Jitter Buffer type is Dynamic, the Minimum Delay specifies the minimum time for which the Dynamic
Jitter Buffer will store the received voice packet before sending it to the DSP for voice processing.
Fax over IP
1.
You can send/receive Fax over IP (FoIP) from a Fax machine connected to the SLT port of the NAVAN.
Select as
Fax Type , the protocol of Fax over IP.